Charles Wentworth-Fitzwilliam, 5th Earl Fitzwilliam

Charles William Wentworth Fitzwilliam, 5th Earl Fitzwilliam in the peerage of Ireland and 3rd Earl Fitzwilliam in the peerage of Great Britain, (4 May 1786 – 4 October 1857) was a British nobleman and politician. He was president three times of the Royal Statistical Society in 1838–1840, 1847–1849, and 1853–1855; and president of the British Association for the Advancement of Science in its inaugural year (1831–2).

Early life He was born on 4 May 1786 as the only son of William Fitzwilliam, 4th Earl Fitzwilliam, who served as Lord President of the Council and Lord Lieutenant of Ireland, and his first wife, Lady Charlotte Ponsonby (daughter of William Ponsonby, 2nd Earl of Bessborough).

The family seat was Wentworth Woodhouse, reputedly the largest private house in England.

Personal life On 8 July 1806, Viscount Milton married his cousin, the Hon. Mary Dundas (1787–1830). Mary was the daughter of Thomas Dundas, 1st Baron Dundas and Lady Charlotte Fitzwilliam (the 4th Earl's sister). They had thirteen children:

Lady Charlotte Wentworth-FitzWilliam (b. 1807) Hon. Margaret Bruce Wentworth-FitzWilliam (1809–1809) Stillborn son (14 November 1834)